Refrigeration



Feb. 16, 1932. F E, SELLMAN 1,845,850

REFRIGERATION Filed Sept. 13, 1930 2 sheets-sh'eet 2 Patented Feb. 16, 1932 UNITED sTATEs PATENT OFFICE YORK, A'SIGNOB T0 ELECTROLUX SERVEL A CORPORATION OF DELAWABE BEI'RIGEBATION Application flled September 13, 1930. Serial No. 481,621.

This invention relates to refrigeration and more particularly to a lens block chiller or device for cooling pitch coated blocks for releasing lenses therefrom. In grinding lenses in the optical trade blocks are coated With pitch or the like to form carriers for the lenses to be ground or otherwise operated upon.

Among the objects of the invention are to provide an automatic lens block chiller having no moving parts which will produce steady, constant refrigeration, in combination With equipment adapted to receive a plurality of lens blocks by means of which the lenses may be more quickly and economically removed from their mounting blocks without injury to the blocks or to the lenses, by the emery, rouge or other grinding compound.

The device consists generally of a casting mounted on the evaporator of a refrigerating unit, the top of such casting being preferably countersunk and being provided with depressions or recesses formed to receive lens blocks.

In the drawings, p

Fig. 1 is a side elevation partly in section illustrating one application of the invention;

Fig. 2, an enlarged similar fragmentary view;

Fig. 3, a top plan view;

ig. 4, a section on the line 4.-4 of Fig. 2; an

Fig. 5, a fragmentary detail section.

The inventi'on as shown in the drawing comprises a cabinet 10 having a top 11 provided with a depending fiange 12 providing an opening beneath which is mounted a casting 13 having pits or depressions 14 for the reception of lens blocks' 15. The casting 13 is mounted upon the evaporator 16 of the Platen-Munters type absorption refrigerating unit known in the trade as Electroluxlfl and having a generator 17 in the base of the machine. The casting 13 is provided with a depending split-sleeve 18 having opposed flanges 19 which are clamped together to bind the sle'eve about the evaporator by means of bolts 20. This lforms a solid support for the casting 13 and the height of the device is determined by the height of the supporting evaporator upon which the casting 13 is vertically adjustable.`

The casting 13 is also provided with a marginal upstanding flange 21 and a recess 22 for supporting and receiving a band or strip 23 preferably of rubber composition or similar non-conducting material. The .upstanding flange forms a sump or basin adapted to receive water or other liquid or substance to be chilled and into which the lens blocks may be submerged. The band 23 extends upwardly beyond the lower edge of the flange 12 of the outer casing and beneath the underside of the top and serves to close the joint between the top and casting. The recesses 14 in the casting 13 are preferably cylindrical in Shape with a marginal recess 24 for receiving a marginal flange of the lens blocks 15.

The upper surfaces of the lens blocks 15 are coated With pitch, tar`or similar material to which the lens isv applied when the material is soft. 'This serves as a mounting for the lenses during grinding, polishing and similar Operations. In order to easily sepal'ate the lenses and the tar or pitch therefrom. i

advantage is taken of the different coelicients of expansion of the lenses and the pitch and by chilling them the pitch is caused to break loose from the lens.

The lens blocks may be chilled merely by conduetivity through the casting 13 or if desired the chamber above the casting formed by the upstanding fiange 21 and the band 23 may be filled or partially filled with water, brine or other liquid which Will cover the lens blocks and lenses. In this way a wet or dry operation may be performed.

In order to aflord means for draining the chamber above the lens block, a drain opening 26 is provided having connection with a depending drain pipe 27 and in order to catch the drain a bucket or other receptacle 28 may be placed upon the upper surface of the generator casing 17. A jacket 29 is placed around the casting 13 and is adapted to be filled with insulating material not shown, for prolonging and increasing the Cooling effect of the device, suchcasing 29 having a horizontal flange which rests upon the flange 21 of the casting 13. While I have described sobe the member 18 as a hollow casting, it may be constructed of sheet metal or other desired construction.

It Will be obvious to those skilled in the art that various other changes may be made in the construction and arrangement Without departing from the spirit of my invention and therefore the invention is not limited to what is shown in the drawin s and .described in the specification but on y as indicated in the appended claims.

I claim:

1. A lens block chiller comprising a chilling unit, a casting supported on said chilling unit in good thermal contact therewith and provided With a rim for retaining a cooling liquid, and means for supporting lens blocks in the liquid for chilling the same.

2. A lens block chiller comprising a chilling unit, a casting supported on said chilling unit in good thermal contact therewith andA provided With recesses for lens blocks- 3. A lens block chiller comprising a chilling unit, and a member having a rec'ess shaped to receive a lens block, said member being arranged in good heat exchange relation With said unit.

4. A lens block chiller comprising a memthe reception of block, and means for supporting said mem ber, the latter being provided with means forming a Chamber for cooling fluid above the lens block.

5. A lens block chiller comprising a body having a surface adapted to form a good thermal contact with a lens block and means for cooling said body.

6. A device of the class described comprising a receptacle for containing a cooling liquid and provided with recesses adapted to receive pitch coated lens blocks, and means for refrigerating said receptacle.

7. Adevice of the class described comprising a receptacle for receiving pitch. coated lens blocks, means for cooling said receptacle for separating the lenses from the lens blocks,

.said receptacle being provided with lens block accommodating recesses for snugly receiving in good thermal contact said lens blocks.

8. The combination of a receptacle for receiving blocks having lenses secured thereto by means of plastic material, means for cooling said receptacle toz cause the plastic material to release the lenses, said receptacle being constructed to receive the heat transferring medium for transferring heat from the lens blocks to the cooling means in addition to the transfer of heat directly by conduction from the lens blocks to the receptacle.

In testimony Whereof I aifix my signature.

FOLKE E. SELLMAN.

r having a recess shaped to receive a lens i 

